JP2019217901A - Pneumatic tire and method for manufacturing resin coating belt - Google Patents

Abstract

To provide a pneumatic tire including a resin coating belt which can improve ride comfort performance, and to provide a method for manufacturing a resin coating belt which can obtain a resin coating belt capable of improving ride comfort performance of a pneumatic tire.SOLUTION: A pneumatic tire includes an annular resin coating belt 6 including a cord and a coating resin for coating the cord, in a tread part. The resin coating belt 6 includes a deformation easy part 20 with a thickness that is thinner in a tire radial direction than surrounding parts.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a pneumatic tire and a method for manufacturing a resin-coated belt.

  BACKGROUND ART Conventionally, in a pneumatic tire, a belt is usually arranged on a radially outer side of a carcass in a tire radial direction in order to tighten a carcass but to exert an effect and increase rigidity of a tread (for example, see Patent Reference 1).

  In recent years, as the demand for reducing the weight of tires has increased, it has been proposed to use a belt obtained by coating a cord with a coating resin. If such a resin-coated belt is used, the rigidity of the resin is higher than the weight, so that the function of the belt can be exhibited while reducing the weight.

JP-A-10-0352220

  By using such a resin-coated belt, the rigidity of the resin-coated belt in the in-plane direction (hereinafter referred to as “in-plane rigidity”) can be increased. The rigidity in the out-of-plane direction (hereinafter, referred to as “out-of-plane rigidity”) is also increased, so that the ride comfort performance is likely to be impaired.

  The present invention provides a pneumatic tire provided with a resin-coated belt capable of improving ride comfort performance, and a method of manufacturing a resin-coated belt capable of obtaining a resin-coated belt capable of improving ride comfort performance of a pneumatic tire. The purpose is to provide.

A pneumatic tire according to a first aspect of the present invention is a pneumatic tire including a cord and an annular resin-coated belt including a coating resin covering the cord in a tread portion. An easy-to-deform portion having a smaller thickness in the tire radial direction is provided.
With such a configuration, ride comfort performance can be improved.

As one embodiment of the present invention, the outer surface of the resin-coated belt in the tire radial direction is formed of an uneven surface, and the easily deformable portion of the resin-coated belt is formed of an outer surface of the resin-coated belt in the tire radial direction. It is formed at the position of the recess.
With such a configuration, the easily deformable portion can be easily formed by processing the outer surface of the resin-coated belt.

As one embodiment of the present invention, the concave-convex surface forming the outer surface in the tire radial direction of the resin-coated belt has the concave portion extending in the tire width direction, and protrudes outward in the tire radial direction, and extends in the tire width direction. The extending convex portion is repeatedly formed in the tire circumferential direction.
With such a configuration, the riding comfort performance can be further improved.

As one embodiment of the present invention, an inner surface of the resin-coated belt in a tire radial direction is constituted by a peripheral surface.
With such a configuration, the easily deformable portion can be easily formed.

As one embodiment of the present invention, the resin-coated belt is constituted by a resin-coated cord made of the cord coated with the coating resin in a state of being spirally wound.
With such a configuration, both steering stability and ride comfort performance can be achieved.

A method for manufacturing a resin-coated belt according to a second aspect of the present invention is a method for manufacturing an annular resin-coated belt including a cord and a coating resin for coating the cord, wherein the rotating body includes an uneven surface on an outer surface. And pressing against at least one surface of the resin coating as a base of the resin coating belt, and transferring the uneven surface of the rotating body to the coating resin constituting the at least one surface of the resin coating. Transfer step.
By adopting such a manufacturing method, a resin-coated belt capable of improving the riding comfort performance of a pneumatic tire can be manufactured.

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of the pneumatic tire provided with the resin-coated belt which can improve a riding comfort performance, and the resin-coated belt which can improve the riding comfort performance of a pneumatic tire can be obtained. , Can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing in the cross section parallel to a tire width direction of the pneumatic tire as one Embodiment of this invention. It is a figure which shows the cross section orthogonal to the tire width direction of the resin coating belt shown in FIG. FIG. 3 is a diagram schematically illustrating an example of a method for manufacturing the resin-coated belt illustrated in FIG. 2. FIG. 3 is a view showing a modification of the tire shown in FIG. 1. FIG. 4 is a view showing a modification of the resin-coated belt shown in FIG. 2.

  Hereinafter, embodiments of a pneumatic tire and a method of manufacturing a resin-coated belt according to the present invention will be described with reference to the drawings. In the drawings, common members / parts are denoted by the same reference numerals.

  Hereinafter, unless otherwise specified, dimensions, length relations, positional relations, etc. of each element are measured in a reference state where a pneumatic tire is mounted on an applicable rim, a specified internal pressure is filled, and no load is applied. And

  Here, the “applicable rim” is an industrial standard effective in a region where a pneumatic tire is produced and used. In Japan, JATMA (Japan Automobile Tire Association) JATMA YEAR BOOK, and in Europe, ETRTO (The European). STANDARDS MANUAL of Tire and Rim Technical Organization, U.S.A. standard rim (ETRTOS MANDAL of ETRTDS NANDAL) in the applicable size described in YEAR BOOK of the TIRE and Rim Association, Inc. (TRA) in the United States or described in the future, etc. Indicates the measuring rim, and Design rim in the case of TRA's YEAR BOOK. In addition, a size that may be included in the above-mentioned industry standard in the future may be included.Examples of the “size to be described in the future” include a size described as “FUTURE DEVELOPMENTS” in the ETRTO 2013 edition. ) Is a rim having a width corresponding to the bead width of the pneumatic tire when the size is not described in the above industrial standards. The "prescribed internal pressure" refers to an air pressure (maximum air pressure) corresponding to the maximum load capacity of a single wheel in an applicable size / prirating described in JATMA YEAR BOOK or the like, and described in the above-mentioned industrial standard. In the case of no size, it refers to the air pressure (maximum air pressure) corresponding to the maximum load capacity specified for each vehicle on which the tire is mounted. In addition, the “maximum load” described later is defined for each tire to which the tire is mounted in the case of a tire having a maximum load capacity of a standard such as JATMA in a tire of an applicable size or a size not described in the above industrial standard. It means the load corresponding to the maximum load capacity.

  FIG. 1 is a diagram showing a pneumatic tire 1 (hereinafter simply referred to as “tire 1”) as the present embodiment. FIG. 1 is a cross-sectional view of the tire 1 in a cross section parallel to the tire width direction A. Hereinafter, this cross section is referred to as “cross section in the tire width direction”. Although the tire 1 of the present embodiment has a configuration symmetrical with respect to the tire equatorial plane CL, it may have a configuration asymmetrical with respect to the tire equatorial plane CL.

  As shown in FIG. 1, the tire 1 has a tread portion 1a, a pair of sidewall portions 1b extending inward in the tire radial direction B from both ends of the tread portion 1a in the tire width direction A, and each sidewall portion 1b. And a pair of beads 1c provided at the inner end in the tire radial direction B. The tire 1 of the present embodiment is a tubeless type radial tire for a passenger car. Here, the “tread portion 1a” means a portion sandwiched between the tread ends TE on both sides in the tire width direction A. The “bead portion 1c” means a portion where a bead member 3 described later is located in the tire radial direction B. The “sidewall portion 1b” means a portion between the tread portion 1a and the bead portion 1c. The “tread end TE” refers to the outermost position in the tire width direction of the ground contact surface in a state where the tire is mounted on the applicable rim, the specified internal pressure is filled, and the maximum load is applied. .

  The tire 1 includes a bead member 3, a carcass 4, a resin-coated belt 6, a tread rubber 7, a side rubber 8, and an inner liner 9.

[Bead member 3]
The bead member 3 is embedded in the bead portion 1c. The bead member 3 includes a bead core 3a and a rubber bead filler 3b located outside the bead core 3a in the tire radial direction B. The bead core 3a has a plurality of bead wires whose periphery is covered with rubber. The bead wire is formed by a steel cord. The steel cord may, for example, consist of a steel monofilament or stranded wire. Note that the bead core 3a of the present embodiment has a configuration in which the bead wire is covered with rubber, but may have a configuration in which the periphery of the bead wire is covered with resin. The bead filler 3b of the present embodiment is made of rubber, but may be made of resin.

[Carcass 4]
The carcass 4 extends between the pair of bead portions 1c, more specifically, between the bead cores 3a of the pair of bead members 3, and extends in a toroidal shape. The carcass 4 has at least a radial structure.

  Further, the carcass 4 includes one or more (one in the present embodiment) carcass plies 4a in which carcass cords are arranged at an angle of, for example, 75 ° to 90 ° with respect to the tire circumferential direction C (see FIG. 1 and the like). Have been. The carcass ply 4a includes a ply body portion located between the pair of bead cores 3a, and a ply fold portion that is folded at both ends of the ply body portion around the bead core 3a from inside to outside in the tire width direction A. ing. Further, a bead filler 3b extending from the bead core 3a to the outside in the tire radial direction B is disposed between the ply body portion and the ply turn-back portion. As the carcass cord constituting the carcass ply 4a, a polyester cord is employed in the present embodiment, but other than this, an organic fiber cord such as nylon, rayon, aramid or a metal cord such as steel is employed as necessary. Is also good. Also, the number of carcass plies 4a may be two or more.

[Resin-coated belt 6]
The resin-coated belt 6 is annular and extends over the entire area in the tire circumferential direction C. The resin-coated belt 6 includes a cord 10b and a coating resin 10a that covers the cord 10b.

  Further, the resin-coated belt 6 is disposed outside the crown portion of the carcass 4 in the tire radial direction B in the tread portion 1a. Specifically, the resin-coated belt 6 of the present embodiment includes one or more (one in the present embodiment) belt layers disposed outside the crown portion of the carcass 4 in the tire radial direction B with respect to the crown portion. I have. More specifically, as shown in FIG. 1, the resin-coated belt 6 of the present embodiment is configured by a circumferential belt 6a including only one circumferential belt layer.

  The circumferential belt 6a as the resin-coated belt 6 of the present embodiment is configured such that a steel cord as a metal belt cord is arranged along the tire circumferential direction C (see FIG. 1 and the like) (10 ° or less with respect to the tire circumferential direction C, (Preferably at an angle of 5 ° or less, more preferably at an angle of 2 ° or less), a spiral belt formed in a state of being spirally wound around a tire central axis. More specifically, the circumferential belt 6a as the resin-coated belt 6 of the present embodiment is formed of a resin-coated cord 10 composed of a cord 10b such as a steel cord covered with a coating resin 10a. More specifically, the circumferential belt 6a as the resin-coated belt 6 is configured by a resin-coated cord 10 composed of a cord 10b covered with a coating resin 10a in a spirally wound state.

  Portions of the resin-coated cord 10 adjacent in the tire width direction A are joined to each other. In the present embodiment, portions of the resin-coated cord 10 adjacent to each other in the tire width direction A are joined by welding a coating resin 10a. However, the portions of the resin-coated cord 10 adjacent to each other in the tire width direction A are not limited to welding, and may be joined by being bonded with an adhesive or the like.

  As shown in FIG. 1, the resin-coated cord 10 of the present embodiment includes two steel cords, but may be a resin-coated cord including only one steel cord, and may include a resin including three or more steel cords. It may be a coated cord.

  As the cord 10b, any known material can be used, for example, the above-described steel cord can be used. The steel cord may, for example, consist of a steel monofilament or stranded wire. Further, the cord 10b may be made of an organic fiber, a carbon fiber, or a stranded wire thereof.

  Further, as the coating resin 10a, for example, a thermoplastic elastomer or a thermoplastic resin can be used, and a resin that is cross-linked by heat or an electron beam or a resin that is cured by thermal rearrangement can also be used. Examples of the thermoplastic elastomer include polyolefin-based thermoplastic elastomer (TPO), polystyrene-based thermoplastic elastomer (TPS), polyamide-based thermoplastic elastomer (TPA), polyurethane-based thermoplastic elastomer (TPU), and polyester-based thermoplastic elastomer (TPC). And dynamically crosslinked thermoplastic elastomers (TPV). Further, examples of the thermoplastic resin include a polyurethane resin, a polyolefin resin, a vinyl chloride resin, and a polyamide resin. Further, as the thermoplastic resin, for example, the deflection temperature under load (under a load of 0.45 MPa) specified in ISO75-2 or ASTM D648 is 78 ° C. or more, and the tensile yield strength specified in JIS K7113 is used. Those having a tensile elongation at break of at least 10 MPa, a tensile elongation at break also specified by JIS K7113, and a Vicat softening temperature (Method A) of 130 ° C. or more specified by JIS K7206 can be used. The tensile modulus (defined by JIS K7113: 1995) of the coating resin 10a that covers the cord 10b is preferably 50 MPa or more. Further, the tensile modulus of the coating resin 10a for coating the cord 10b is preferably 1000 MPa or less. It is assumed that the coating resin 10a does not include rubber (an organic polymer substance exhibiting rubber elasticity at normal temperature).

  FIG. 2 is a diagram showing a cross section of the resin-coated belt 6 orthogonal to the tire width direction A. As shown in FIG. 2, the annular resin-coated belt 6 includes an easily deformable portion 20 having a smaller thickness in the tire radial direction B than its surroundings. By providing the easy-to-deform portion 20 on the annular resin-coated belt 6, the in-plane rigidity of the annular resin-coated belt can be maintained, the out-of-plane rigidity can be reduced, and the riding comfort performance can be improved.

  More specifically, the outer surface of the resin-coated belt 6 of the present embodiment in the tire radial direction B is formed of an uneven surface. The easily deformable portion 20 of the resin-coated belt 6 of the present embodiment is formed at the position of the concave portion 20a on the outer surface of the resin-coated belt 6 in the tire radial direction B. That is, the resin-coated belt 6 of the present embodiment includes the easily deformable portion 20 at the position of the concave portion 20a on the outer surface in the tire radial direction B. As described above, if the position of the concave portion 20a on the outer surface of the resin-coated belt 6 is the easily deformable portion 20 which is thinner than the surroundings, the easily deformable portion 20 can be easily formed by processing the outer surface of the resin-coated belt 6.

  Further, a concave portion 20 a extending in the tire width direction A, a concave portion 20 a extending in the tire width direction A, and a concave / convex surface forming the outer surface in the tire radial direction B (the outer surface in the tire radial direction B) of the resin-coated belt 6 of the present embodiment B and a convex portion 20b extending in the tire width direction A are formed repeatedly in the tire circumferential direction C. More specifically, the outer surface of the resin-coated belt 6 of the present embodiment in the tire radial direction B is a distance (hereinafter simply referred to as a “radius”) in the tire radial direction B from the tire center axis as going in the tire circumferential direction C. ) Is formed by a wavy uneven surface that repeats the increase and decrease of With such an uneven surface, variation in the out-of-plane rigidity of the resin-coated belt 6 in the tire circumferential direction C can be suppressed. Thereby, the riding comfort performance can be further improved.

  The plurality of protrusions 20b are arranged at a predetermined distance in the tire circumferential direction C, and the distance between two adjacent protrusions 20b in the tire circumferential direction C is independent of the position in the tire circumferential direction C. It is almost constant. As described above, by dispersing and arranging the plurality of protrusions 20b at a constant pitch in the tire circumferential direction C, it is possible to suppress variation in out-of-plane rigidity in the tire circumferential direction C. Thereby, the riding comfort performance can be further improved.

  The radius of the top of the plurality of projections 20b is substantially constant regardless of the position in the tire circumferential direction C. As described above, by making the radii of the apexes of the plurality of protrusions 20b arranged at different positions in the tire circumferential direction C substantially constant, it is possible to suppress variation in out-of-plane rigidity in the tire circumferential direction C. Thereby, the riding comfort performance can be further improved.

  Further, the concave portion 20a of the present embodiment is a groove extending in the tire width direction A having a V-shaped cross section in a cross-sectional view orthogonal to the tire width direction A (see FIG. 2). Specifically, the groove as the concave portion 20a of the present embodiment is defined by two groove surfaces 21 and 22 forming the bottom 23 by the intersecting ridge lines. Therefore, in the resin-coated belt 6 of the present embodiment, when an external force such as a ground contact load acts from an out-of-plane direction, the position of the concave portion 20a is deformed prior to the peripheral position in the tire circumferential direction C. For example, when a ground contact load from the ground is applied to the resin-coated belt 6, the position of the concave portion 20a moves while the groove surfaces 21 and 22 move closer to each other across the bottom portion 23 (moving so as to reduce the angle of the V shape). , Inward in the tire radial direction B. In other words, the concave portion 20a of the present embodiment is provided with the bottom portion 23, so that it can easily bend sufficiently against an external force from an out-of-plane direction, such as a ground load, as compared with the position around the bottom portion 23. Out-of-plane rigidity can be reduced. As a result, ride comfort performance can be further improved.

  The shape of the recess 20a is not limited to the shape of the present embodiment. For example, a concave portion formed by a concave curved surface may be used. Further, the recess may have another shape (see FIG. 5). From the viewpoint that the out-of-plane stiffness can be locally and efficiently reduced, it is preferable to provide the bottom portion 23 that is easily bent by an external force from the out-of-plane direction, like the concave portion 20a of the present embodiment. On the other hand, from the viewpoint of avoiding excessive stress concentration, for example, it is preferable that the concave portion is formed by a concave curved surface that becomes a concave curved line in a cross-sectional view orthogonal to the tire width direction A.

  Further, as in the present embodiment, it is preferable that the inner surface of the resin-coated belt 6 in the tire radial direction B (the inner surface in the tire radial direction B) is not an uneven surface but a peripheral surface. Although both surfaces of the resin-coated belt 6 in the tire radial direction B may be formed with uneven surfaces, processing is easier if one of the surfaces is formed as an uneven surface. Further, the outer surface of the resin-coated belt 6 in the tire radial direction B is easier to process than the inner surface of the resin-coated belt 6 in the tire radial direction B. That is, the easily deformable portion 20 is easily formed. Therefore, it is particularly preferable that the outer surface of the resin-coated belt 6 in the tire radial direction B is formed by an uneven surface, and the inner surface of the resin-coated belt 6 in the tire radial direction B is formed by a peripheral surface.

  In addition, it is preferable that the minimum thickness of the easily deformable portion 20 is 以上 or more of the maximum thickness of the resin-coated belt 6 (the thickness at the top of the convex portion 20b in the present embodiment).

  The resin-coated belt 6 of the present embodiment has a configuration in which the resin-coated cord 10 is formed in a state of being spirally wound, but is arranged in a plurality in the tire width direction A, along the tire circumferential direction C, or There is no particular limitation as long as the cord 10b that extends at an angle smaller than 10 ° with respect to the tire circumferential direction C is covered with the covering resin 10a. However, it is preferable that the resin-coated cord 10 is formed in a state of being spirally wound like the resin-coated belt 6 of the present embodiment. In this way, the in-plane rigidity of the resin-coated belt 6 in the tire circumferential direction can be increased, and the steering stability can be improved. In addition, the out-of-plane rigidity can be reduced by the easily deformable portion 20, and the riding comfort performance can be improved. be able to. That is, both steering stability and ride comfort performance can be achieved.

[Tread rubber 7 and side rubber 8]
The tread rubber 7 forms an outer surface of the tread portion 1a in the tire radial direction B (hereinafter, referred to as “tread outer surface”), and the tread outer surface of the present embodiment has a tire circumferential direction C (FIG. 1 and the like, and a tread pattern including a circumferential groove 7a extending in the tire width direction A and a width groove (not shown) extending in the tire width direction A are formed. The side rubber 8 forms an outer surface of the sidewall portion 1b in the tire width direction A, and is formed integrally with the tread rubber 7 described above.

[Inner liner 9]
The inner liner 9 is laminated on the inner surface of the carcass 4, and in the present embodiment, is formed of butyl rubber having low air permeability. The butyl rubber means butyl rubber and halogenated butyl rubber which is a derivative thereof.

  Next, an example of a method for manufacturing the resin-coated belt according to the present invention will be described. The method for manufacturing a resin-coated belt according to the present invention is applicable as a method for manufacturing the above-described annular resin-coated belt 6 (see FIG. 1). Here, as an example of a method of manufacturing the resin-coated belt according to the present invention, an example of a method of manufacturing the above-described annular resin-coated belt 6 (see FIG. 1) will be described. FIG. 3 is a diagram illustrating an outline of an example of a method for manufacturing the resin-coated belt 6.

  In the method of manufacturing the resin-coated belt 6 shown in FIG. The resin-coated belt 6 is pressed against an outer surface of the resin-coated belt 6 in the tire radial direction B, and the uneven surface of the rotating body 30 is moved to one side of the resin-coated body 31, more specifically, in this embodiment, the resin-coated belt 6 includes a transfer step of transferring to the coating resin 10a (see FIG. 1) constituting the outer surface in the tire radial direction B.

  Specifically, the resin-coated body 31 of the present embodiment is the resin-coated cord 10 (see FIG. 1). In the present embodiment, the resin-coated cord 10 as the resin-coated body 31 is spirally wound around the drum 33 while being softened by heat from hot air (see arrows in FIG. 3) or the like from the heater 34. In the present embodiment, the uneven surface of the outer surface of the roller as the rotating body 30 is pressed against the resin-coated cord 10 as the resin-coated body 31 softened by heat, and the uneven surface is transferred to the resin-coated cord 10. Specifically, the resin-coated cord 10 is conveyed between the outer surface of the drum 33 and the outer surface of the rotating body 30 while being softened by heat. The conveyed resin-coated cord 10 is sandwiched between the outer surface of the drum 33 and the outer surface of the rotating body 30 so that the above-described uneven surface is transferred to the coating resin 10a (see FIG. 1) and It is wound.

  Note that, as described above, the resin-coated cord 10 is wound around the drum 33 while being wound in the tire width direction A in the axial direction of the drum 33 (hereinafter referred to as “tire axial direction A” for convenience of description). Are joined together by welding. In the present embodiment, the resin-coated cord 10 is wound around the drum 33 while the side surface of the resin-coated cord 10 in the tire width direction A is melted by heat. Are bonded by welding the coating resin 10a.

  As described above, in the present embodiment, the above-described transfer step is performed simultaneously with the winding step of spirally winding the resin-coated cord 10. By doing so, the number of steps can be reduced and the manufacturing efficiency can be increased as compared with the case where the winding step and the transfer step are separately performed.

  In the example shown in FIG. 3, the uneven surface is transferred to one of the outer surfaces in the tire radial direction B of the resin-coated cord 10 as the resin-coated body 31 wound around the drum 33. The uneven surface may be transferred to another surface that is the inner surface in the tire radial direction B. In such a case, for example, an uneven surface may be provided on the outer surface of the drum 33. As described above, in the transfer step, the uneven surface is transferred to at least one of the outer surface in the tire radial direction of the resin coating 31 and the inner surface in the tire radial direction of the resin coating 31. I do.

  In the present embodiment, the resin-coated cord 10 is used as the resin-coated body 31. However, the original shape of the belt-shaped belt in which the plurality of cords 10b (see FIG. 1) are covered with the coating resin 10a (see FIG. 1). May be used as a resin coating.

  In addition to the method of transferring the uneven surface to the resin-coated body 31 as in the method of manufacturing the resin-coated belt 6 shown in FIG. 3, a method of performing post-processing such as cutting and deformation after forming the original shape of the resin-coated belt. May form an uneven surface. However, from the viewpoint of increasing the production efficiency, it is preferable to use a transfer step as in the method for producing the resin-coated belt 6 shown in FIG.

  The uneven surface of the resin-coated belt 6 does not disappear during vulcanization, and is maintained in the finished tire 1 after vulcanization.

  The pneumatic tire according to the present invention is not limited to the specific configurations shown in the above-described embodiments and modifications, and various modifications and changes can be made without departing from the scope of the claims.

  Further, the resin ring 5 may be disposed between the carcass 4 and the resin-coated belt 6. FIG. 4 is a diagram illustrating the tire 101 in which the resin ring 5 is disposed between the carcass 4 and the resin-coated belt 6.

  As shown in FIG. 4, the resin ring 5 is disposed on the tread portion 1a. The resin annular body 5 shown in FIG. 4 is disposed between the carcass 4 and the resin-coated belt 6 at a position outside the crown portion of the carcass 4 in the tire radial direction B. The resin annular body 5 is in contact with the coating resin 10 a of the resin coating belt 6. Further, the resin annular body 5 extends to the outside of the resin-coated belt 6 in the tire width direction A.

  Unlike the resin-coated belt 6, the resin annular body 5 has no cord. That is, no cord is arranged in the resin annular body 5.

  As the resin constituting the resin annular body 5, for example, a thermoplastic elastomer or a thermoplastic resin can be used similarly to the materials exemplified as the material of the above-described coating resin 10a, and a resin which is crosslinked by heat or an electron beam. Alternatively, a resin that is cured by thermal dislocation can be used. Note that the resin constituting the resin ring 5 does not include rubber (an organic polymer substance exhibiting rubber elasticity at room temperature).

  By providing such a resin annular body 5, the resin-coated belt 6 can be reinforced, and damage to the resin-coated belt 6 can be suppressed.

  FIG. 5 is a view showing a resin-coated belt 106 as a modified example of the resin-coated belt 6 shown in FIG. On the outer surface of the resin-coated belt 106 shown in FIG. 5 in the tire radial direction B, a convex portion 120b formed by a curved surface protruding outward in the tire radial direction B is formed along the tire circumferential direction C. A plurality is provided. On the outer surface of the resin-coated belt 106 shown in FIG. 5 in the tire radial direction B, a concave portion 120a is defined between two adjacent convex portions 120b in the tire circumferential direction C. That is, the outer surface of the resin-coated belt 106 shown in FIG. 5 in the tire radial direction B is an uneven surface formed by the concave portions 120a and the convex portions 120b. The protrusion 120b shown in FIG. 5 extends over the entire area of the resin-coated belt 106 in the tire width direction A. The recess 120a shown in FIG. 5 is a groove extending over the entire area of the resin-coated belt 106 in the tire width direction A. Therefore, the easily deformable portion 120 of the resin-coated belt 106 shown in FIG. 5 is formed at the position of the concave portion 120a on the outer surface in the tire radial direction B.

  The present invention relates to a pneumatic tire and a method for manufacturing a resin-coated belt.

1, 101: pneumatic tire, 1a: tread, 1b: sidewall, 1c: bead, 3: bead member, 3a: bead core, 3b: bead filler, 4: carcass, 4a: carcass ply, 5: resin ring Body, 6, 106: resin-coated belt, 6a: circumferential belt, 7: tread rubber, 7a: circumferential groove, 8: side rubber, 9: inner liner, 10: resin-coated cord, 10a: coated resin, 10b: cord 20, 120: easily deformable portion, 20a, 120a: concave portion, 20b, 120b: convex portion, 21, 22: groove surface, 23: bottom portion, 30: rotating body, 31: resin coating body, 33: drum, 34: Heater, A: tire width direction, B: tire radial direction, C: tire circumferential direction, CL: tire equatorial plane, TE: tread edge

Claims (6)

An annular resin-coated belt including a cord and a coating resin covering the cord, a pneumatic tire including a tread portion,
The pneumatic tire, wherein the resin-coated belt includes an easily deformable portion having a smaller thickness in the tire radial direction than the surroundings. The outer surface of the resin-coated belt in the tire radial direction is constituted by an uneven surface,
The pneumatic tire according to claim 1, wherein the easily deformable portion of the resin-coated belt is formed at a position of a concave portion on an outer surface in a tire radial direction of the resin-coated belt.   The concave and convex portions extending in the tire width direction, and the convex portions projecting outward in the tire radial direction and extending in the tire width direction are provided on the uneven surface forming the outer surface in the tire radial direction of the resin-coated belt. The pneumatic tire according to claim 2, which is formed repeatedly in a circumferential direction.   4. The pneumatic tire according to claim 2, wherein an inner surface of the resin-coated belt in a tire radial direction is formed by a peripheral surface. 5.   5. The resin-coated belt according to claim 1, wherein the resin-coated belt is configured by a resin-coated cord made of the cord coated with the coating resin in a state of being spirally wound. 6. Pneumatic tires. A method for producing an annular resin-coated belt including a cord and a coating resin covering the cord,
A rotating body having an uneven surface on the outer surface is pressed against at least one surface of the resin coating that is the base of the resin-coated belt, and the uneven surface of the rotating body is pressed against at least one of the resin coatings. A method for producing a resin-coated belt, including a transfer step of transferring the resin-coated belt to the coating resin constituting a surface.

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